Grilling is a great way to get your bok choy crispy and tender. I'd recommend brushing the bok choy with butter or olive oil just to avoid sticking and then placing it on the grill on medium-high heat. Watch it closely; it should only be about 3 to 4 minutes on each side. Take it off the grill and add the rhubarb dressing from the previous recipe, it's a great combination of flavors. Enjoy!